CN219469812U - Sewage biological treatment system adopting high-concentration activated sludge - Google Patents
Sewage biological treatment system adopting high-concentration activated sludge Download PDFInfo
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- CN219469812U CN219469812U CN202320114081.2U CN202320114081U CN219469812U CN 219469812 U CN219469812 U CN 219469812U CN 202320114081 U CN202320114081 U CN 202320114081U CN 219469812 U CN219469812 U CN 219469812U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The utility model discloses a sewage biological treatment system adopting high-concentration activated sludge, which comprises a biological treatment tank, an aeration system, a high-concentration secondary sedimentation tank, sludge discharge equipment, a spinning plate, a sludge reflux system and a surplus sludge discharge system, wherein the aeration system is arranged in the biological treatment tank, and the sludge discharge equipment and at least 1 spinning plate are arranged in the high-concentration secondary sedimentation tank. The high-concentration secondary sedimentation tank can discharge active sludge with the sludge concentration of more than 17 g/L in a shorter time, thereby realizing the high-concentration active sludge process in municipal sewage treatment plants economically, simply and easily.
Description
Technical Field
The utility model relates to the technical field of sewage treatment, in particular to a sewage biological treatment system adopting high-concentration activated sludge.
Background
The municipal sewage treatment plant mainly adopts an activated sludge process to purify sewage, and aims to remove organic matters in the sewage and perform denitrification and dephosphorization. The sewage biological treatment system of the municipal sewage treatment plant adopting the activated sludge method comprises a biological treatment tank, an aeration system, a secondary sedimentation tank, a sludge reflux system and a surplus sludge discharge system, wherein the secondary sedimentation tank is an important link for carrying out solid-liquid separation and reflecting the final effect of biological treatment. Through decades of practical application and continuous development and perfection, the technology of the secondary sedimentation tank is mature and perfected. The secondary sedimentation tank is mainly composed of radial sedimentation tank, horizontal sedimentation tank, vertical sedimentation tank, inclined plate (pipe) sedimentation tank, etc. The slurry water discharged into the secondary sedimentation tank from the biological treatment tank of the municipal sewage treatment plant contains various micro-solid matters such as microorganisms, dust and the like, and the slurry water is subjected to mud-water separation through the secondary sedimentation tank to obtain clean water and active sludge. In the biological treatment process of sewage, most of active sewage slurry separated from the secondary sedimentation tank is discharged into the biological treatment tank through a sludge reflux system and is mixed with sewage entering a municipal sewage treatment plant, so that enough microorganism is kept in the biological treatment tank, and the sewage treatment effect is ensured. The secondary sedimentation tank is a gravity sedimentation tank, and under normal conditions, the residence time of the secondary sedimentation tank is 2.5-3.5 hours, and the sludge concentration of the discharged active sludge is 8-11 g/L.
The activated sludge process is classified into a conventional activated sludge process and a high concentration activated sludge process. In a system for sewage treatment by using a conventional activated sludge process, the activated sludge concentration (MLSS) of a biological treatment tank is generally 2 g/L to 5 g/L. In a system for sewage treatment by a high-concentration activated sludge process, the activated sludge concentration (MLSS) in a biological treatment tank is generally 6 g/L to 10 g/L. Compared with the conventional activated sludge process, the high-concentration activated sludge process has very remarkable advantages, and mainly comprises the following aspects: (1) high treatment efficiency and good treatment effect; (2) the capability of bearing impact load is large, and the treatment effect is stable; (3) the discharge amount of the excess sludge can be reduced; (4) For newly built municipal sewage treatment plants, the scale of biochemical engineering can be reduced, the investment is saved, and the occupied area is reduced; (5) The prior municipal sewage treatment plant adopting the conventional activated sludge treatment process is transformed into the high-concentration activated sludge treatment process, so that the productivity of the prior municipal sewage treatment plant can be greatly improved, and the energy consumption can be greatly reduced.
The key difficulty of the method is that the method can be used for carrying out solid-liquid separation economically, simply and easily to obtain active sludge with higher concentration (such as more than 15 g/L), and meanwhile, the operation of treatment equipment and facilities cannot be adversely affected, and the sewage treatment effect cannot be negatively affected. Because of the great superiority of the high-concentration activated sludge process, technological staff have developed a great deal of research on the high-concentration activated sludge process in the late 70 th century, and have proposed various solid-liquid separation methods and ways of realizing the high-concentration activated sludge process. The method for realizing the high-concentration activated sludge process in engineering mainly comprises the following steps: ferric salt high mud, silt high mud, magnetic powder high mud, air floatation high mud, MBR high mud, SBR high mud, low surface load high mud reflux ratio secondary sedimentation tank, and the defects of the approaches are unstable operation or high operation cost. At present, the high-concentration activated sludge method system which is applied to more engineering only has MBR, and the MBR has high investment cost and high operation cost, but has excellent treatment effect, so the method is applied to some areas with extremely high requirements on drainage standards. For various reasons, the high concentration activated sludge process has not been the mainstream in the municipal wastewater treatment field. Municipal sewage treatment plants have so far been dominated by the conventional activated sludge process.
The technology described by the patent name of a high-efficiency thickener (patent number 2022218592174) is applied, a high-concentration secondary sedimentation tank is designed and manufactured and used for precipitating the muddy water discharged by the biological treatment tank, and the actual operation achieves very remarkable application effect: after the high-concentration secondary sedimentation tank is full, the operation is carried out for 1 hour, and the sludge concentration of the discharged active sludge is stably more than 17 g/L. When the residence time of the common secondary sedimentation tank is more than 5 hours, the sludge concentration of the discharged active sludge is only possible to be more than 17 g/L.
The utility model develops a novel sewage biological treatment system which is economical, simple, convenient and easy to implement and adopts a high-concentration activated sludge method, and is the problem to be solved by the utility model.
Disclosure of Invention
The utility model aims to solve the defects of the prior art and provides a sewage biological treatment system adopting high-concentration activated sludge.
To achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides an adopt sewage biological treatment system of high concentration activated sludge, includes biological treatment pond, aeration system, high concentration secondary sedimentation tank, the equipment of arranging mud, spinning board, mud reflux system, surplus sludge discharge system, biological treatment pond is linked together with high concentration secondary sedimentation tank, high concentration secondary sedimentation tank is linked together with the one end of mud reflux system, the other end of mud reflux system is linked together with biological treatment pond, high concentration secondary sedimentation tank is linked together with surplus mud discharge system, biological treatment pond is provided with the aeration system, be provided with the equipment of arranging mud and at least 1 piece board in the high concentration secondary sedimentation tank, contained angle between spinning board and the horizontal plane is 3 ~ 75, the sum of the projected area of all spinning boards that set up in the high concentration secondary sedimentation tank at the horizontal plane is greater than 0.82% of the projected area of the water body when high concentration secondary sedimentation tank is full capacity, spinning board can be rotatory around the axial lead with the horizontal plane contained angle is 70 ~90, the outer fringe linear velocity of spinning board when rotatory is less than 5.6 meters/minute.
Preferably, holes are distributed on the spinning plates, and the spinning plates are arranged in a layered mode.
Preferably, the high-concentration secondary sedimentation tank is a advection sedimentation tank, the mud discharging equipment is a chain mud scraper, the chain mud scraper is provided with a chain and a scraper blade, an equipment platform is arranged between the scraper blade close to the top of the high-concentration secondary sedimentation tank and the scraper blade positioned at the bottom of the high-concentration secondary sedimentation tank, the equipment platform is fixedly connected with a high-concentration secondary sedimentation tank body, at least 1 waterproof motor power device is arranged on the equipment platform, the waterproof motor power device is in transmission connection with a rotating shaft, the rotating shaft is fixedly connected with a rotating plate, and the rotating plate can rotate along with the rotation of the rotating shaft.
Preferably, the high-concentration secondary sedimentation tank is a advection sedimentation tank, the sludge discharge device is a chain sludge scraper, the chain sludge scraper is provided with a chain and a scraping plate, the upper part of the high-concentration secondary sedimentation tank is provided with a device platform, at least 1 motor power device is arranged on the device platform, the motor power device is in transmission connection with a rotating shaft, the rotating shaft is fixedly connected with a rotating plate, and the rotating plate can rotate along with the rotation of the rotating shaft.
Preferably, the high-concentration secondary sedimentation tank is a radial sedimentation tank, the sludge discharge device is a rotary sludge discharge device, the spinning plate is fixedly connected with the rotary sludge discharge device, and the spinning plate rotates along with the rotation of the rotary sludge discharge device.
Preferably, the high-concentration secondary sedimentation tank is a radial sedimentation tank, the sludge discharge device is a rotary sludge discharge device, the spinning plate is fixedly connected with a grid support, the grid support is fixedly connected with the rotary sludge discharge device, and the grid support and the spinning plate rotate along with the rotation of the rotary sludge discharge device.
Preferably, the high-concentration secondary sedimentation tank is a radial sedimentation tank, the radial sedimentation tank is provided with a central support, the sludge discharge equipment is rotary sludge discharge equipment, the upper part of the tank body of the high-concentration secondary sedimentation tank is provided with a circular pavement platform, the high-concentration secondary sedimentation tank is provided with a plurality of cross bars, one end of each cross bar is movably connected with the central support, the other end of each cross bar is connected with a roller, the rollers are in contact with the circular pavement platform, the cross bars are fixedly connected with grid supports, the grid supports are fixedly connected with rotary pressing plates, and the rotary pressing plates can rotate around the central support of the high-concentration secondary sedimentation tank.
Preferably, the high-concentration secondary sedimentation tank is a radial sedimentation tank, the radial sedimentation tank is provided with a central support, the sludge discharge equipment is rotary sludge discharge equipment, the upper part of the tank body of the high-concentration secondary sedimentation tank is provided with a circular pavement platform, the high-concentration secondary sedimentation tank is provided with a plurality of equipment platforms, one end of each equipment platform is movably connected with the central support, the other end of each equipment platform is connected with a roller, the rollers are in contact with the circular pavement platform, at least 1 motor power device is arranged on each equipment platform, the motor power device is in transmission connection with a rotating shaft, the rotating shaft is fixedly connected with a rotary pressing plate, the equipment platforms can rotate around the central support of the high-concentration secondary sedimentation tank, and the rotary pressing plate can rotate along with the rotation of the rotating shaft.
Preferably, the roller is driven by a motor drive.
Preferably, the spinning plates are arranged in 4-100 layers, the number of the spinning plates in each layer is 1-100, an included angle between 2-50 layers of spinning plates and a horizontal plane is 10-65 degrees from the bottom of the high-concentration secondary sedimentation tank upwards, and the included angle between the rest layers of spinning plates and the horizontal plane is 5-35 degrees.
Preferably, the biological treatment tank comprises an aerated biochemical tank, or comprises an AO biochemical tank, or comprises an AOA biochemical tank, or comprises a modified AAO biochemical tank, or comprises an inverted AAO biochemical tank, or comprises a modified multistage AO biochemical tank, or comprises a UCT biochemical tank, or comprises a mutt biochemical tank, or comprises an oxidation ditch, or comprises a carrousel oxidation ditch, or comprises an obel oxidation ditch, or comprises a DE-type oxidation ditch, or comprises a biological contact oxidation tank, or comprises an aerated biochemical tank and a biological selector, or comprises an AO biochemical tank and a biological selector, or comprises an AOA biochemical tank and a biological selector, or comprises an AAO biochemical tank and a biological selector, or comprises a modified AAO biochemical tank and a biological selector, or comprises an inverted AAO biochemical tank and a biological selector, or comprises a modified multistage AO biochemical tank and a biological selector, or comprises a UCT biochemical tank and a biological selector, or comprises a mut oxidation ditch and a biological selector, or comprises an oxidation ditch and a biological selector.
In combination with the technical scheme, the utility model has the beneficial effects that:
(1) The method is simple and easy to operate, and the existing municipal sewage treatment plant can stably realize the application of the high-concentration activated sludge method in production only by installing the rotary pressing plate and the matched equipment in the existing secondary sedimentation tank and modifying the rotary pressing plate into the high-concentration secondary sedimentation tank under the condition that the original operation parameters of the secondary sedimentation tank are not changed and the sludge concentration of the discharged activated sludge is more than 17 g/L.
(2) In the high-concentration secondary sedimentation tank, the economical efficiency is good, the motor power device drives the rotary pressing plate to slowly rotate for 1-2 hours, the sludge concentration of active sludge discharged by the high-concentration secondary sedimentation tank can be stably more than 17 g/L, only a small amount of electric energy is consumed in the whole solid-liquid separation process, and other medicaments and auxiliary agents are not added.
(3) The technology of the utility model is adopted to save investment and project land for newly constructing municipal sewage treatment plants, and can greatly reduce investment and project land. The technology of the utility model can greatly improve the productivity of the existing municipal sewage treatment plant, thereby saving a great amount of investment and construction land.
(4) Energy conservation can be realized by modifying the conventional activated sludge process of the prior municipal sewage treatment plant into a high-concentration activated sludge process, and the energy consumption can be reduced by more than 30 percent.
The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model, as well as the preferred embodiments thereof, together with the following detailed description of the utility model, given by way of illustration only, together with the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of the system of the present utility model.
FIG. 2 is a schematic diagram of a high concentration secondary sedimentation tank of the present utility model.
FIG. 3 is a schematic top view of the high concentration secondary sedimentation tank of the present utility model.
FIG. 4 is a schematic diagram of a high concentration secondary sedimentation tank of the present utility model.
FIG. 5 is a schematic diagram III of the structure of the high-concentration secondary sedimentation tank of the utility model.
FIG. 6 is a schematic diagram of a high concentration secondary sedimentation tank of the present utility model.
FIG. 7 is a schematic diagram of a high concentration secondary sedimentation tank of the present utility model.
FIG. 8 is a schematic diagram of a high concentration secondary sedimentation tank of the present utility model.
Fig. 9 is a schematic diagram showing a top view structure of the high concentration secondary sedimentation tank of the present utility model.
In the figure: the high-concentration secondary sedimentation tank 10, a muddy water inlet end 101, a mud discharge end 102, a clear water outlet end 103, a chain type mud scraper 11, a chain 111, a scraping plate 112, a rotary mud discharging device 12, a rotary shaft 121, a spinning plate 13, holes 131, a grid support 14, a device platform 15, a motor power device 151, a rotary shaft 152, a center support 16, a circular pavement platform 17, a cross rod 18, rollers 19, a motor driving device 191, a working bridge 20, a scraping plate 21 and a reinforcing structural member 22.
Detailed Description
As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8 and fig. 9, a sewage biological treatment system adopting high-concentration activated sludge comprises a biological treatment tank, an aeration system, a high-concentration secondary sedimentation tank 10, a sludge discharge device, a spinning plate 13, a sludge backflow system and a residual sludge discharge system, wherein the biological treatment tank is communicated with the high-concentration secondary sedimentation tank 10, the high-concentration secondary sedimentation tank 10 is communicated with one end of the sludge backflow system, the other end of the sludge backflow system is communicated with the biological treatment tank, the high-concentration secondary sedimentation tank 10 is communicated with the residual sludge discharge system, the biological treatment tank is provided with an aeration system, the high-concentration secondary sedimentation tank 10 is internally provided with a sludge discharge device and at least 1 spinning plate 13, an included angle between the spinning plate 13 and a horizontal plane is 3-75 degrees, the sum of the projected area of all spinning plates 13 arranged in the high-concentration secondary sedimentation tank 10 is larger than 0.82% of the water body spinning when the spinning of the high-concentration secondary sedimentation tank 10 is full, and the included angle between the spinning plate and the water body can rotate around the horizontal plane is smaller than 6.13-5 m/90 degrees when the rotating around the horizontal plane. At present, a municipal sewage treatment plant adopting an activated sludge method comprises a sewage biological treatment system comprising a biological treatment tank, an aeration system, a secondary sedimentation tank (common type), a sludge reflux system and a surplus sludge discharge system, wherein the sludge concentration of activated sludge discharged by the secondary sedimentation tank (common type) is 8-11 g/L, and the influence factors in all aspects are comprehensively considered, so that only the conventional activated sludge method process can be adopted. The sewage biological treatment system comprises a biological treatment tank, an aeration system, a high-concentration secondary sedimentation tank 10, a sludge reflux system and a residual sludge discharge system. A large number of microorganisms are arranged in the biological treatment tank, and the biological treatment tank is a place for purifying sewage by the microorganisms. The aeration system is used for filling oxygen into the sewage in the biological treatment tank and providing oxygen for the growth and propagation of microorganisms and the purification of the sewage. The aeration system mainly comprises a blast aeration system, a surface aeration system and a diving jet aeration system. The common blast aeration system consists of a blast blower, a gas conveying pipe and a microporous aerator or a microporous aeration pipe, wherein the blast blower is connected with one end of the gas conveying pipe, and the other end of the gas conveying pipe is connected with the microporous aerator or the microporous aeration pipe. The common surface aeration systems are an inverted umbrella type aerator and a rotary brush aerator. The high concentration secondary sedimentation tank 10 is used for separating mud from water. A sludge discharge device and a spinning plate 13 are arranged in the high-concentration secondary sedimentation tank 10. The sludge discharging device is used for discharging the activated sludge thick slurry at the bottom of the high-concentration secondary sedimentation tank 10. The sludge discharging device applied to the high-concentration secondary sedimentation tank 10 mainly comprises a rotary sludge discharging device 12 and a chain type sludge scraper 11, wherein the rotary sludge discharging device 12 mainly comprises a rotary sludge scraping and sucking machine, a rotary sludge scraping machine and a rotary sludge sucking machine. The rotary sludge discharging apparatus 12 is divided into two main types, namely, a center drive rotary sludge discharging apparatus and a peripheral drive rotary sludge discharging apparatus. The rotary sludge discharging apparatus 12 may be classified into a full-bridge type rotary sludge discharging apparatus and a half-bridge type rotary sludge discharging apparatus according to the shape of the working bridge 20. The spinning plate 13 is a key component for obtaining high-concentration active sludge in the high-concentration secondary sedimentation tank 10. The included angle between the spinning plate 13 and the horizontal plane is 3-75 degrees, the sum of the projection areas of all the spinning plates 13 arranged in the high-concentration secondary sedimentation tank 10 on the horizontal plane is greater than 0.82% of the projection area of the water body on the horizontal plane when the high-concentration secondary sedimentation tank 10 is full, the spinning plate 13 can rotate around the axial lead with the included angle of 70-90 degrees with the horizontal plane, and the outer edge linear speed control of the spinning plate 13 during rotation is less than 5.6 m/min so as not to weaken the sedimentation compression effect of the activated sludge. The rotating spinning plate 13 can promote the formation of larger flocs in a shorter time by various micro-solid matters such as microorganisms, dust and the like contained in the slurry water in the high-concentration secondary sedimentation tank 10, promote the flocs to sink at a higher speed, and promote the volume shrinkage and water separation of the flocs. The main characteristic of the high-concentration secondary sedimentation tank 10, which is different from the common secondary sedimentation tank, is that a certain number of spinning plates 13 with a certain inclination angle are arranged in the high-concentration secondary sedimentation tank 10. The high-concentration secondary sedimentation tank 10 carries out high-efficiency mud-water separation on the slurry water treated by the biological treatment tank to obtain clean water and active sludge, wherein the sludge concentration of the active sludge is more than 17 g/L, and a necessary condition is provided for the smooth implementation of a high-concentration active sludge method. The biological treatment tank is communicated with the high-concentration secondary sedimentation tank 10 in a first mode of a pipeline or a ditch or a wall hole, in a second mode of a sewage pump and a pipeline, and in a third mode of a sewage pump and a ditch. The sludge recirculation system is used for discharging the high-concentration activated sludge discharged from the high-concentration secondary sedimentation tank 10 into the biological treatment tank as recirculation sludge. The sludge recirculation system comprises a pipeline, or comprises a ditch, or comprises a sludge recirculation pump and a pipeline, or comprises a sludge recirculation pump and a ditch. The excess sludge discharge system functions to discharge the high concentration activated sludge discharged from the high concentration secondary sedimentation tank 10 as excess sludge. The excess sludge discharge system comprises a pipe, or comprises a ditch, or comprises a excess sludge pump and a pipe, or comprises a excess sludge pump and a ditch. According to the utility model, an inlet end of a biological treatment tank is connected with a sewage input pipe, an outlet end of the biological treatment tank is communicated with a mud water inlet end 101 of a high-concentration secondary sedimentation tank 10 through a sewage pump and a pipeline, a mud discharge end 102 of the high-concentration secondary sedimentation tank 10 is communicated with an inlet end of a mud reflux pump, an outlet end of the mud reflux pump is communicated with one end of a pipeline or a ditch, the other end of the pipeline or the ditch is communicated with the inlet end of the biological treatment tank, the mud discharge end 102 of the high-concentration secondary sedimentation tank 10 is communicated with an inlet end of a residual mud pump, an outlet end of the residual mud pump is communicated with one end of the pipeline or the ditch, a clear water outlet end 103 of the high-concentration secondary sedimentation tank 10 is communicated with a drain pipe, an aeration system is arranged in the biological treatment tank, a microporous aerator is arranged at the bottom of the biological treatment tank and is communicated with a blower through a gas conveying pipe, and mud discharging equipment and at least 1 spinning plate 13 are arranged in the high-concentration secondary sedimentation tank 10.
Specifically, as shown in fig. 2, 3 and 8, holes 131 are distributed on the spinning plate 13, and the spinning plate 13 is layered. According to the utility model, the spinning plate 13 is provided, the holes 131 are distributed on the spinning plate 13, and when the spinning plate 13 moves to extrude the flocs below the spinning plate 13, more water and less flocs pass through the holes 131 of the spinning plate 13, so that the slurry concentration below the spinning plate 13 is higher than that above the spinning plate 13, and therefore, the spinning plate 13 provided with the holes 131 has a better effect of promoting the separation of the flocs from the water than the spinning plate 13 not provided with the holes 131. The holes 131 are circular holes 131, or elliptical holes 131, or rectangular holes 131, or square holes 131, or polygonal holes 131. The spin plate 13 may be made of a metal orifice plate, or made of a plastic orifice plate, or made of a wood orifice plate, or made of a metal screen, or made of a plastic screen. Each spinning plate 13 has a certain action height range in the vertical direction, so that the spinning plates 13 are layered in order to enable the spinning plates 13 to act on the whole slurry layer at the same time and enable the activated sludge to sink and compress rapidly in a short time.
Specifically, as shown in fig. 2 and 3, the high-concentration secondary sedimentation tank 10 is a horizontal sedimentation tank, the sludge discharge device is a chain sludge scraper 11, the chain sludge scraper 11 is provided with a chain 111 and a scraper 112, a device platform 15 is arranged between the scraper 112 near the top of the high-concentration secondary sedimentation tank 10 and the scraper 112 at the bottom of the high-concentration secondary sedimentation tank 10, the device platform 15 is fixedly connected with the tank body of the high-concentration secondary sedimentation tank 10, at least 1 waterproof motor power device 151 is installed on the device platform 15, the waterproof motor power device 151 is in transmission connection with a rotating shaft 152, the rotating shaft 152 is fixedly connected with a spinning plate 13, and the spinning plate 13 can rotate along with the rotation of the rotating shaft 152. The chain mud scraper 11 is provided with a chain 111 and a scraper 112, an equipment platform 15 is arranged between the scraper 112 near the top of the high-concentration secondary sedimentation tank 10 and the scraper 112 at the bottom of the high-concentration secondary sedimentation tank 10, the equipment platform 15 is positioned below the water surface and is fixedly connected with the tank body of the high-concentration secondary sedimentation tank 10, at least 1 waterproof motor power device 151 is arranged on the equipment platform 15, the waterproof motor power device 151 is in transmission connection with a rotating shaft 152, and the rotating shaft 152 is fixedly connected with a rotating pressing plate 13. The equipment platform 15, the waterproof motor power device 151, the rotating shaft 152 and the spinning plate 13 are arranged between the scraping plate 112 close to the top of the high-concentration secondary sedimentation tank 10 and the scraping plate 112 positioned at the bottom of the high-concentration secondary sedimentation tank 10, so that the existing advection sedimentation tank can be conveniently and rapidly optimized and upgraded. According to the width condition of the high-concentration secondary sedimentation tank 10, the equipment platform 15 can be provided with a plurality of waterproof motor power devices 151, for example, when the width of the high-concentration secondary sedimentation tank 10 is 10 meters and the rotation radius of the spinning plate 13 is 1 meter, 1 equipment platform 15 can be provided with 4 waterproof motor power devices 151. When the waterproof motor power device 151 drives the rotating shaft 152 to rotate, the spinning plate 13 rotates along with the rotation of the rotating shaft 152, and the rotating spinning plate 13 can promote various micro solid matters such as microorganisms, dust and the like contained in the slurry water in the high-concentration secondary sedimentation tank 10 to form larger flocs in a shorter time, can promote the flocs to sink at a higher speed, and can promote the volume shrinkage and water separation of the flocs.
Specifically, as shown in fig. 4, the high-concentration secondary sedimentation tank 10 is a horizontal sedimentation tank, the sludge discharge device is a chain sludge scraper 11, the chain sludge scraper 11 is provided with a chain 111 and a scraper 112, the upper portion of the high-concentration secondary sedimentation tank 10 is provided with a device platform 15, at least 1 motor power device 151 is installed on the device platform 15, the motor power device 151 is in transmission connection with a rotating shaft 152, the rotating shaft 152 is fixedly connected with a spinning plate 13, and the spinning plate 13 can rotate along with the rotation of the rotating shaft 152. According to the utility model, the upper part of the high-concentration secondary sedimentation tank 10 is provided with an equipment platform 15, at least 1 motor power device 151 is arranged on the equipment platform 15, the motor power device 151 is in transmission connection with a rotating shaft 152, and the rotating shaft 152 is fixedly connected with a rotary pressing plate 13. The equipment platform 15 and the motor power device 151 are not under the water surface, so that the equipment has no waterproof requirement, and is convenient to overhaul and maintain. The blades 112 of the chain scraper 11 are all in the mud zone. The rotating plate 13 and the rotating shaft 152 are disposed above the squeegee 112 so as not to affect the movement of the squeegee 112. According to the width of the high concentration secondary sedimentation tank 10, the equipment platform 15 can be provided with a plurality of motor power devices 151, for example, when the width of the high concentration secondary sedimentation tank 10 is 10 meters and the rotation radius of the spinning plate 13 is 1 meter, 1 equipment platform 15 can be provided with 4 motor power devices 151. When the motor power device 151 drives the rotating shaft 152 to rotate, the spinning plate 13 rotates along with the rotation of the rotating shaft 152, the rotating spinning plate 13 can promote various micro solid matters such as microorganisms, dust and the like contained in the slurry water in the high-concentration secondary sedimentation tank 10 to form larger flocs in a shorter time, the flocs can be promoted to sink at a higher speed, and the shrinkage of the flocs volume and the water separation can be promoted.
Specifically, as shown in fig. 5, the high-concentration secondary sedimentation tank 10 is a radial sedimentation tank, the sludge discharge device is a rotary sludge discharge device 12, the spinning plate 13 is fixedly connected with the rotary sludge discharge device 12, and the spinning plate 13 rotates along with the rotation of the rotary sludge discharge device 12. According to the utility model, the spinning plate 13 can be fixedly connected with the rotating shaft 121 of the rotary mud discharging device 12, and can also be connected with the truss of the rotary mud discharging device 12. The rotary pressing plate 13 can be fixedly connected with the rotary shaft 121 of the rotary mud discharging device 12 through a shaft clip, and can also be connected with a truss of the rotary mud discharging device 12 through the shaft clip. The spinning plate 13 can rotate along with the rotation of the rotary mud discharging device 12, and the rotating spinning plate 13 can promote the formation of larger flocs in a shorter time by various micro-solid matters such as microorganisms, dust and the like contained in the slurry water in the high-concentration secondary sedimentation tank 10, promote the flocs to sink at a higher speed, and promote the shrinkage of the flocs and the water separation.
Specifically, as shown in fig. 6, the high-concentration secondary sedimentation tank 10 is a radial sedimentation tank, the sludge discharge device is a rotary sludge discharge device 12, the spinning plate 13 is fixedly connected with a grid support 14, the grid support 14 is fixedly connected with the rotary sludge discharge device 12, and the grid support 14 and the spinning plate 13 rotate along with the rotation of the rotary sludge discharge device 12. According to the utility model, the spinning plate 13 can be connected with the grid support 14 in a welding or screw connection mode, the grid support 14 can be fixedly connected with the rotating shaft 121 of the rotary mud discharging device 12 through the axle holder, and also can be connected with the truss of the rotary mud discharging device 12 through the axle holder. The grid support 14 and the spinning plate 13 can rotate along with the rotation of the rotary mud discharging device 12, and the rotating spinning plate 13 can promote various micro solid matters such as microorganisms, dust and the like contained in the slurry water in the high-concentration secondary sedimentation tank 10 to form larger flocs in a shorter time, can promote the flocs to sink at a higher speed, and can promote the shrinkage of the flocs and the water separation; meanwhile, the small vortex is formed at the back of the grid bar arranged in the vertical direction of the rotating grid bar bracket 14, which is favorable for the agglomeration among biochemical sludge slurry particles and causes cavities to destroy a sludge net structure and a gluing state, so that moisture and bubbles in the sludge net structure are easy to separate, and the sedimentation of solids is promoted.
Specifically, as shown in fig. 7, the high-concentration secondary sedimentation tank 10 is a radial sedimentation tank, the radial sedimentation tank is provided with a center support 16, the sludge discharge device is a rotary sludge discharge device 12, a circular pavement platform 17 is arranged at the upper part of the tank body of the high-concentration secondary sedimentation tank 10, the high-concentration secondary sedimentation tank 10 is provided with a plurality of cross bars 18, one ends of the cross bars 18 are movably connected with the center support 16, the other ends of the cross bars 18 are connected with rollers 19, the rollers 19 contact the circular pavement platform 17, the cross bars 18 are fixedly connected with grid supports 14, the grid supports 14 are fixedly connected with spinning plates 13, and the spinning plates 13 can rotate around the center support 16 of the high-concentration secondary sedimentation tank 10. According to the utility model, the high-concentration secondary sedimentation tank 10 is provided with a center support 16, a round pavement platform 17 and a plurality of cross bars 18, and one end of each cross bar 18 can be directly and movably connected with the center support 16 or indirectly and movably connected with the center support 16. One end of the cross bar 18 is indirectly and movably connected with the center support 16, and one end of the cross bar 18 is fixedly connected with the rotary mud discharging device 12, and the rotary mud discharging device 12 is movably connected with the center support 16. The other end of the cross bar 18 is connected to a roller 19, the roller 19 contacting the circular walkway platform 17. The cross rod 18 is fixedly connected with the grid support 14, and the grid support 14 is fixedly connected with the rotary pressing plate 13. For the purpose of enhancing structural strength and stability, a reinforcing structure may be provided, wherein the reinforcing structure, the working bridge 20 and the cross bars 18 of the rotary mud discharging device 12 form a stable triangular structure, and the reinforcing structure and the two adjacent cross bars 18 form a stable triangular structure. The grid support 14 and the spinning plate 13 can rotate along with the rotation of the rotary mud discharging device 12, and the rotating spinning plate 13 can promote various micro solid matters such as microorganisms, dust and the like contained in the slurry water in the high-concentration secondary sedimentation tank 10 to form larger flocs in a shorter time, can promote the flocs to sink at a higher speed, and can promote the shrinkage of the flocs and the water separation; meanwhile, the small vortex is formed at the back of the grid bar arranged in the vertical direction of the rotating grid bar bracket 14, which is favorable for the agglomeration among biochemical sludge slurry particles and causes cavities to destroy a sludge net structure and a gluing state, so that moisture and bubbles in the sludge net structure are easy to separate, and the sedimentation of solids is promoted.
Specifically, as shown in fig. 8 and 9, the high-concentration secondary sedimentation tank 10 is a radial sedimentation tank, the radial sedimentation tank is provided with a center support 16, the sludge discharge device is a rotary sludge discharge device 12, a circular pavement platform 17 is arranged at the upper part of the tank body of the high-concentration secondary sedimentation tank 10, the high-concentration secondary sedimentation tank 10 is provided with a plurality of device platforms 15, one end of the device platform 15 is movably connected with the center support 16, the other end of the device platform 15 is connected with a roller 19, the roller 19 contacts the circular pavement platform 17, at least 1 motor power device 151 is arranged on the device platform 15, the motor power device 151 is in transmission connection with a rotating shaft 152, the rotating shaft 152 is fixedly connected with a spinning plate 13, the device platform 15 can rotate around the center support 16 of the high-concentration secondary sedimentation tank 10, and the spinning plate 13 can rotate along with the rotation of the rotating shaft 152. According to the utility model, the high-concentration secondary sedimentation tank 10 is provided with a center support 16, a circular pavement platform 17 and a plurality of equipment platforms 15, wherein one end of each equipment platform 15 can be directly and movably connected with the center support 16, and can also be indirectly and movably connected with the center support 16. One end of the equipment platform 15 is indirectly and movably connected with the center support 16, and one end of the equipment platform 15 is fixedly connected with the rotary mud discharging equipment 12, and the rotary mud discharging equipment 12 is movably connected with the center support 16. The other end of the equipment platform 15 is connected with a roller 19, and the roller 19 contacts the circular pavement platform 17. At least 1 motor power device 151 is arranged on the equipment platform 15, the motor power device 151 is in transmission connection with a rotating shaft 152, and the rotating shaft 152 is fixedly connected with the rotating plate 13. When the diameter of the high concentration secondary sedimentation tank 10 is 25 meters and the radius of rotation of the spinning plate 13 is 1 meter, 5 motor power units 151 can be arranged on the 1-equipment platform 15. In order to enhance the structural strength and stability, a reinforcing structural member 22 may be provided, wherein the reinforcing structural member 22, the working bridge 20 and the equipment platform 15 of the rotary mud discharging equipment 12 form a stable triangular structure, and the reinforcing structural member 22 and the two adjacent equipment platforms 15 form a stable triangular structure. The spinning plate 13 can rotate along with the rotation of the rotating shaft 152, and can also rotate around the center support 16 of the high-concentration secondary sedimentation tank 10 along with the rotation of the rotary mud discharging equipment 12, and the rotating spinning plate 13 can promote various tiny solid matters such as microorganisms, dust and the like contained in the mud water in the high-concentration secondary sedimentation tank 10 to form larger flocs in a shorter time, can promote the flocs to sink at a higher speed, and can promote the shrinkage of the flocs volume and the water separation.
Specifically, as shown in fig. 7 and 8, the roller 19 is driven by a motor driving device 191. When the technology of the utility model is applied to the existing municipal sewage treatment plant, the power of the motor driving device 191 of the original rotary sludge discharge device 12 is not necessarily enough to drive the newly added devices and components such as the spinning plate 13, the motor power device 151, the cross rod 18 or the device platform 15, and the like, and at this time, the roller 19 is required to be driven by the motor driving device 191.
Specifically, as shown in fig. 2, 6, 7 and 8, the spinning plates 13 are arranged in 4-100 layers, the number of spinning plates 13 in each layer is 1-100, an included angle between 2-50 layers of spinning plates 13 and a horizontal plane is 10-65 degrees from the bottom of the high-concentration secondary sedimentation tank 10 upwards, and an included angle between the rest of spinning plates 13 and the horizontal plane is 5-35 degrees. According to the utility model, the number of layers of the spinning plate 13 cannot exceed the theoretical maximum value under the premise of not influencing the sedimentation, compression and densification of the activated sludge at a certain height. When the number of spinning plates 13 per layer is set, the number of spinning plates 13 required is small if a large area of spinning plates 13 is used, and the number of spinning plates 13 required is large if a small area of spinning plates 13 is used. Within a certain number range, the sludge concentration of the activated sludge increases with the number of layers of spinning plates 13 and the number of spinning plates 13 per layer. The residence time of the high-concentration secondary sedimentation tank 10 is generally 2.5-3.5 hours, so that the compression and thickening time of the activated sludge is relatively short. In order to obtain a high concentration of activated sludge in as short a time as possible, the number of spinning plates 13 and the number of spinning plates 13 per layer should be increased as theoretically possible. In the utility model, the included angle between the spinning plate 13 at the lower part of the rotating shaft 152 and the horizontal plane is larger than the included angle between the spinning plate 13 at the upper part of the rotating shaft 152 and the horizontal plane, which is beneficial to improving the concentration of active sewage slurry, so that the included angle between 2-50 layers of spinning plates 13 and the horizontal plane is 10-65 degrees from the bottom of the high-concentration secondary sedimentation tank 10 upwards, and the included angle between the rest layers of spinning plates 13 and the horizontal plane is 5-35 degrees.
Specifically, the biological treatment tank comprises an aeration biochemical tank, or comprises an AO biochemical tank, or comprises an AOA biochemical tank, or comprises an AAO biochemical tank, or comprises a modified AAO biochemical tank, or comprises an inverted AAO biochemical tank, or comprises a modified multistage AO biochemical tank, or comprises a UCT biochemical tank, or comprises a MUCT biochemical tank, or comprises an oxidation ditch, or comprises a Carlusel oxidation ditch, or comprises an Obeli oxidation ditch, or comprises a DE-type oxidation ditch, or comprises a biological contact oxidation tank, or comprises an aeration biochemical tank and a biological selector, or comprises an AO biochemical tank and a biological selector, or comprises an AOA biochemical tank and a biological selector, or comprises an AAO biochemical tank and a biological selector, or comprises a modified AAO biochemical tank and a biological selector, or comprises an inverted AAO biochemical tank and a biological selector, or comprises an AOO biochemical tank and a biological selector, or comprises a modified multistage AO biochemical tank and a biological selector, or comprises a UCT biochemical tank and a biological selector, or comprises a MUCT oxidation ditch and a biological selector, or comprises an oxidation ditch and a biological selector.
Examples
Design parameters of a municipal sewage treatment plant: the inflow water flow is 10000 cubic meters per day, the activated sludge concentration (MLSS) of the biological treatment tank is 4 g/liter, a common secondary sedimentation tank is adopted, the activated sludge concentration (MLSS) of the reflux biological treatment tank is 10 g/liter, and the sludge reflux ratio is 66.7%.
The technology is adopted to carry out transformation and upgrading, the common secondary sedimentation tank is transformed into the high-concentration secondary sedimentation tank 10 (the design installation power of the high-concentration secondary sedimentation tank 10 is 5.5KW, the daily electricity consumption is less than 100 KWH), the concentration of the activated sludge in the reflux biological treatment tank (MLSS) is 20 g/liter, the reflux ratio of the sludge is 66.7%, and the concentration of the activated sludge in the biological treatment tank (MLSS) is 8 g/liter, so that the application of the high-concentration activated sludge method in municipal sewage treatment plants can be realized economically, simply and easily.
Operation of the high concentration secondary sedimentation tank 10 when the feeding mud water MLSS was 3.79 g/liter and the surface load was 0.9 cubic meter/(square meter hour):
(1) The rotary pressing plate 13 rotates for 0 hour, and the MLSS of the discharged activated sludge slurry is 9.5 g/L;
(2) The rotary pressing plate 13 rotates for 1 hour, and the MLSS of the discharged activated sludge slurry is 18.2 g/L;
(3) The spinning plate 13 was rotated for 2 hours, and the discharged activated sludge slurry MLSS was 21.3 g/l.
The foregoing is illustrative of the present utility model and is not to be construed as limiting thereof, and it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the utility model, which is also intended to be within the scope of the utility model.
Claims (10)
1. A sewage biological treatment system adopting high-concentration activated sludge is characterized in that: the device comprises a biological treatment tank, an aeration system, a high-concentration secondary sedimentation tank, sludge discharge equipment, spinning plates, a sludge backflow system and a surplus sludge discharge system, wherein the biological treatment tank is communicated with the high-concentration secondary sedimentation tank, the high-concentration secondary sedimentation tank is communicated with one end of the sludge backflow system, the other end of the sludge backflow system is communicated with the biological treatment tank, the high-concentration secondary sedimentation tank is communicated with the surplus sludge discharge system, the biological treatment tank is provided with the aeration system, the high-concentration secondary sedimentation tank is internally provided with the sludge discharge equipment and at least 1 spinning plate, the included angle between the spinning plates and a horizontal plane is 3-75 degrees, the sum of the projection areas of all spinning plates arranged in the high-concentration secondary sedimentation tank is greater than 0.82% of the projection area of a water body on the horizontal plane when the high-concentration secondary sedimentation tank is full, the spinning plates can rotate around an axis line with an included angle of 70-90 degrees, and the peripheral linear velocity of the spinning plates during rotation is less than 5.6 m/min.
2. A sewage biological treatment system using high concentration activated sludge according to claim 1, wherein: holes are distributed on the spinning plates, and the spinning plates are arranged in a layered mode.
3. A sewage biological treatment system using high concentration activated sludge according to claim 1, wherein: the high-concentration secondary sedimentation tank is a horizontal sedimentation tank, the sludge discharge device is a chain type sludge scraper, the chain type sludge scraper is provided with a chain and a scraping plate, an equipment platform is arranged between the scraping plate close to the top of the high-concentration secondary sedimentation tank and the scraping plate positioned at the bottom of the high-concentration secondary sedimentation tank, the equipment platform is fixedly connected with a high-concentration secondary sedimentation tank body, at least 1 waterproof motor power device is arranged on the equipment platform, the waterproof motor power device is in transmission connection with a rotating shaft, the rotating shaft is fixedly connected with a rotating plate, and the rotating plate can rotate along with the rotation of the rotating shaft.
4. A sewage biological treatment system using high concentration activated sludge according to claim 1, wherein: the high-concentration secondary sedimentation tank is a horizontal flow sedimentation tank, the sludge discharge device is a chain sludge scraper, the chain sludge scraper is provided with a chain and a scraping plate, the upper part of the high-concentration secondary sedimentation tank is provided with a device platform, at least 1 motor power device is arranged on the device platform, the motor power device is in transmission connection with a rotating shaft, the rotating shaft is fixedly connected with a rotating plate, and the rotating plate can rotate along with the rotation of the rotating shaft.
5. A sewage biological treatment system using high concentration activated sludge according to claim 1, wherein: the high-concentration secondary sedimentation tank is a radial sedimentation tank, the sludge discharge device is rotary sludge discharge device, the spinning plate is fixedly connected with the rotary sludge discharge device, and the spinning plate rotates along with the rotation of the rotary sludge discharge device.
6. A sewage biological treatment system using high concentration activated sludge according to claim 1, wherein: the high-concentration secondary sedimentation tank is a radial sedimentation tank, the sludge discharge device is rotary sludge discharge device, the spinning plate is fixedly connected with a grid support, the grid support is fixedly connected with the rotary sludge discharge device, and the grid support and the spinning plate rotate along with the rotation of the rotary sludge discharge device.
7. A sewage biological treatment system using high concentration activated sludge according to claim 1, wherein: the high-concentration secondary sedimentation tank is a radial sedimentation tank, the radial sedimentation tank is provided with a center support, mud discharging equipment is rotary mud discharging equipment, the upper portion of a tank body of the high-concentration secondary sedimentation tank is provided with a circular pavement platform, the high-concentration secondary sedimentation tank is provided with a plurality of cross bars, one end of each cross bar is movably connected with the center support, the other end of each cross bar is connected with a roller, the rollers are in contact with the circular pavement platform, the cross bars are fixedly connected with grid supports, the grid supports are fixedly connected with rotary pressing plates, and the rotary pressing plates can rotate around the center support of the high-concentration secondary sedimentation tank.
8. A sewage biological treatment system using high concentration activated sludge according to claim 1, wherein: the high-concentration secondary sedimentation tank is a radial sedimentation tank, the radial sedimentation tank is provided with a center support, mud discharging equipment is rotary mud discharging equipment, the upper portion of a tank body of the high-concentration secondary sedimentation tank is provided with a circular pavement platform, the high-concentration secondary sedimentation tank is provided with a plurality of equipment platforms, one end of each equipment platform is movably connected with the center support, the other end of each equipment platform is connected with a roller, the rollers are in contact with the circular pavement platform, at least 1 motor power device is mounted on each equipment platform, the motor power device is in transmission connection with a rotating shaft, the rotating shaft is fixedly connected with a rotating plate, the equipment platforms can rotate around the center support of the high-concentration secondary sedimentation tank, and the rotating plate can rotate along with the rotation of the rotating shaft.
9. A sewage biological treatment system using high concentration activated sludge according to claim 7 or 8, wherein: the rollers are driven by a motor drive.
10. A sewage biological treatment system using high concentration activated sludge according to claim 4 or 6 or 7 or 8, wherein: the spinning plates are arranged in 4-100 layers, the number of each layer of spinning plates is 1-100, an included angle between 2-50 layers of spinning plates and a horizontal plane is 10-65 degrees from the bottom of the high-concentration secondary sedimentation tank upwards, and the included angle between the rest layers of spinning plates and the horizontal plane is 5-35 degrees.
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| CN202320114081.2U CN219469812U (en) | 2023-02-04 | 2023-02-04 | Sewage biological treatment system adopting high-concentration activated sludge |
| PCT/CN2024/073727 WO2024160097A1 (en) | 2023-02-04 | 2024-01-23 | Wastewater biological treatment system utilizing high-concentration activated sludge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024160097A1 (en) * | 2023-02-04 | 2024-08-08 | 深圳佰思嘉科技有限公司 | Wastewater biological treatment system utilizing high-concentration activated sludge |
| WO2024174795A1 (en) * | 2023-02-24 | 2024-08-29 | 深圳佰思嘉科技有限公司 | Biochemical reaction tank |
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2023
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024160097A1 (en) * | 2023-02-04 | 2024-08-08 | 深圳佰思嘉科技有限公司 | Wastewater biological treatment system utilizing high-concentration activated sludge |
| WO2024174795A1 (en) * | 2023-02-24 | 2024-08-29 | 深圳佰思嘉科技有限公司 | Biochemical reaction tank |
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